It is a very old unit, still working fine, but it’s more than 25 years old, so I wonder if it would be advisable to do it. I have taken the amplifier module out though there was a fuse issue a few years ago and lately took a look again. All the electrolytic caps seem fine, no bulging or leaks. The most difficult task would be the separation of the board itself from the metal chassis/ heatsink platform and was wondering if anyone here has done this for some orientation. Thanks!